Editor's TipEditor's Tip

Keep hair healthy from start to finish with Number 4 Birchbox Exclusive Hair Revival Kit.

Number 4 Hair Care

Birchbox Breakdown

Situation: Your hair is dry and brittle and you’re a few weeks (perhaps a few paychecks) away from a trim. Solution: A super-hydrating leave-in treatment. We’re partial to Number 4’s™ Lumiere d’hiver Reconstructing Masque because it infuses moisture and protein (the two things that hair needs most!) into strands, leaving our hair soft, shiny, and in far better shape than it was before.

How it Works

Soy protein works to reconstruct and strengthen hair while natural conditioners like shea butter, jojoba seed oil, and sunflower oil nourish and moisturize. Don’t forget about the silkiness factor — for that, there’s silicone polymer, which smoothes and detangles.

How to Use

After shampooing, wring excess moisture from hair. Apply evenly to hair starting at the ends and working your way upward to your scalp. Wait for two to five minutes, then rinse thoroughly.

More for You!
  • Product orders $50+ and all monthly box brands ship free
  • Free returns within 90 days of purchase
  • Extra samples and gifts in the Bonus Shop

Product Reviews & Sample Feedback

4.2 out of 5 stars, based on 257 reviews 257 Reviews
4.2 out of 5 stars
5 Star
159
4 Star
105
3 Star
46
2 Star
17
1 Star
14
Hair type
Curly
Dry
Fine
Frizzy
Kinky
Normal
Oily
Straight
Thick
Wavy
Hair color
Brown
Blonde
Black
White or gray
Red
Other
Age
17 & under
18-24
25-34
35-44
45-54
55 & over
Apply

Most Helpful Customer Reviews

Hair
Sampled

Wonderful product I really enjoyed it smelled good

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To die for!
Sampled

I have very hard water and despite our salt based water softener it still wrecks my hair. I loved this hair mask it actually made my hair feel soft after shampooing it, even after using a clarifying shampoo (which tend to dry out my hair). I wish the sample size was bigger so that I could use it a second time to ensure that it isn't a one hit wonder because the full size price is pretty steep. I will definitely be on the lookout for a promotion until I am ready to treat myself to such a luxurious hair product.

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Great Product
Sampled

This worked well and wasn't heavy on my hair. I don't really need a re-constructor on a regular basis but it was a good product

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So smooth!
Sampled

This leaves my hair feeling so smooth! I love what it does for my hair!

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Nice!
Sampled

Wasnt the greatest thing but it was decent. Definitely left hair feeling more hydrated, wasn't in love with the scent.

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Concentrated
Sampled

The nice thing about this shampoo is that it is really concentrated so you do not have to use a lot so you will get your monies worth. It really foams up too!

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great product
Sampled

my hair has been so dry and stringy like all winter, this masque helped with frizz and making my hair feel smooth and soft again

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Meg
Sampled

Love keeping my hair moisturized as it breaks a lot. I recommend.

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love
Sampled

pleasantly surprised by this product. i thought it was very effective, and actually delivers!

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Number 4
Sampled

This was great on my long, wavy thick hair. It smells great, too!

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